EP2086258A1 - Verfahren für einen HARQ-Aufwärtsverbindungsbetrieb bei Ablauf des Zeitanpassungszeitgebers - Google Patents

Verfahren für einen HARQ-Aufwärtsverbindungsbetrieb bei Ablauf des Zeitanpassungszeitgebers Download PDF

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Publication number
EP2086258A1
EP2086258A1 EP09001422A EP09001422A EP2086258A1 EP 2086258 A1 EP2086258 A1 EP 2086258A1 EP 09001422 A EP09001422 A EP 09001422A EP 09001422 A EP09001422 A EP 09001422A EP 2086258 A1 EP2086258 A1 EP 2086258A1
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European Patent Office
Prior art keywords
terminal
data
buffers
harq
timer
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Granted
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EP09001422A
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English (en)
French (fr)
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EP2086258B1 (de
Inventor
Sung-Jun Park
Seung-June Yi
Young-Dae Lee
Sung-Duck Chun
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LG Electronics Inc
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LG Electronics Inc
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Priority to EP13003661.9A priority Critical patent/EP2665306B1/de
Priority to EP14003021.4A priority patent/EP2836007B1/de
Publication of EP2086258A1 publication Critical patent/EP2086258A1/de
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Publication of EP2086258B1 publication Critical patent/EP2086258B1/de
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1861Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W80/00Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02Data link layer protocols
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1835Buffer management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1864ARQ related signaling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1874Buffer management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1896ARQ related signaling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/04Error control

Definitions

  • the present invention relates to a radio (wireless) communication system providing a radio communication service and a mobile terminal, and more particularly, to a method of an uplink HARQ operation of the mobile terminal in an Evolved Universal Mobile Telecommunications System (E-UMTS) or a Long Term Evolution (LTE) system.
  • E-UMTS Evolved Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • FIG 1 shows an exemplary network structure of an Evolved Universal Mobile Telecommunications System (E-UMTS) as a mobile communication system to which a related art and the present invention are applied.
  • E-UMTS Evolved Universal Mobile Telecommunications System
  • the E-UMTS system is a system that has evolved from the existing UMTS system, and its standardization work is currently being performed by the 3GPP standards organization.
  • the E-UMTS system can also be referred to as a LTE (Long-Term Evolution) system.
  • LTE Long-Term Evolution
  • the E-UMTS network can roughly be divided into an E-UTRAN and a Core Network (CN).
  • the E-UTRAN generally comprises a terminal (i.e., User Equipment (UE)), a base station (i.e., eNode B), an Access Gateway (AG) that is located at an end of the E-UMTS network and connects with one or more external networks.
  • the AG may be divided into a part for processing user traffic and a part for handling control traffic.
  • an AG for processing new user traffic and an AG for processing control traffic can be communicated with each other by using a new interface.
  • One eNode B may have one or more cells.
  • An interface for transmitting the user traffic or the control traffic may be used among the eNode Bs.
  • the CN may comprise an AG, nodes for user registration of other UEs, and the like. An interface may be used to distinguish the E-UTRAN and the CN from each other.
  • the various layers of the radio interface protocol between the mobile terminal and the network may be divided into a layer 1 (L1), a layer 2 (L2) and a layer 3 (L3), based upon the lower three layers of the Open System Interconnection (OSI) standard model that is well-known in the field of communications systems.
  • Layer 1 (L1) namely, the physical layer, provides an information transfer service to an upper layer by using a physical channel
  • RRC Radio Resource Control
  • L3 located in the lowermost portion of the Layer 3 (L3) performs the function of controlling radio resources between the terminal and the network.
  • the RRC layer exchanges RRC messages between the terminal and the network.
  • the RRC layer may be located by being distributed in network nodes such as the eNode B, the AG, and the like, or may be located only in the eNode B or the AG.
  • FIG. 2 shows exemplary control plane architecture of a radio interface protocol between a terminal and a UTRAN (UMTS Terrestrial Radio Access Network) according to the 3GPP radio access network standard.
  • the radio interface protocol as shown in Fig. 2 is horizontally comprised of a physical layer, a data link layer, and a network layer, and vertically comprised of a user plane for transmitting user data and a control plane for transferring control signaling.
  • the protocol layer in Fig. 2 may be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based upon the lower three layers of the Open System Interconnection (OSI) standards model that is widely known in the field of communication systems.
  • OSI Open System Interconnection
  • the physical layer uses a physical channel to provide an information transfer service to a higher layer.
  • the physical layer is connected with a medium access control (MAC) layer located thereabove via a transport channel, and data is transferred between the physical layer and the MAC layer via the transport channel. Also, between respectively different physical layers, namely, between the respective physical layers of the transmitting side (transmitter) and the receiving side (receiver), data is transferred via a physical channel.
  • MAC medium access control
  • the Medium Access Control (MAC) layer of Layer 2 provides services to a radio link control (RLC) layer (which is a higher layer) via a logical channel.
  • RLC radio link control
  • the RLC layer of Layer 2 supports the transmission of data with reliability. It should be noted that if the RLC functions are implemented in and performed by the MAC layer, the RLC layer itself may not need to exist.
  • the PDCP layer of Layer 2 performs a header compression function that reduces unnecessary control information such that data being transmitted by employing Internet Protocol (IP) packets, such as IPv4 or IPv6, can be efficiently sent over a radio interface that has a relatively small bandwidth.
  • IP Internet Protocol
  • the Radio Resource Control (RRC) layer located at the lowermost portion of Layer 3 is only defined in the control plane, and handles the control of logical channels, transport channels, and physical channels with respect to the configuration, re-configuration and release of radio bearers (RB).
  • the RB refers to a service that is provided by Layer 2 for data transfer between the mobile terminal and the UTRAN.
  • channels used in downlink transmission for transmitting data from the network to the mobile terminal there is a Broadcast Channel (BCH) used for transmitting system information, and a downlink Shared Channel (SCH) used for transmitting user traffic or control messages.
  • BCH Broadcast Channel
  • SCH downlink Shared Channel
  • a downlink multicast, traffic of broadcast service or control messages may be transmitted via the downlink SCH or via a separate downlink Multicast Channel (MCH).
  • RACH Random Access Channel
  • SCH uplink Shared Channel
  • PBCH Physical Broadcast Channel
  • PMCH Physical Multicast Channel
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • uplink physical channels for transmitting information transferred via the channels used in uplink transmission over a radio interface between the network and the terminal, there is a Physical Uplink Shared Channel (PUSCH) for transmitting uplink SCH information, a Physical Random Access Channel (PRACH) for transmitting RACH information, and a Physical Uplink Control Channel (PUCCH) for transmitting control information provided by the first and second layers, such as a HARQ ACK or NACK, a Scheduling Request (SR), a Channel Quality Indicator (CQI) report, and the like.
  • PUSCH Physical Uplink Shared Channel
  • PRACH Physical Random Access Channel
  • PUCCH Physical Uplink Control Channel
  • a HARQ operation is performed in a MAC (Medium Access Control) layer for an effective data transmission.
  • MAC Medium Access Control
  • FIG. 4 is an exemplary view showing a HARQ operation method for an effective data transmission.
  • a base station or eNB may transmit downlink scheduling information (referred as 'DL scheduling information' hereafter) through a PDCCH (Physical Downlink Control Channel) in order to provide data to a terminal (UE) during a HARQ operation.
  • the DL scheduling information may include a UE identifier (UE ID), a UE group identifier (Group ID), an allocated radio resource assignment, a duration of the allocated radio resource assignment, a transmission parameter (e.g., Modulation method, payload size, MIMO related information, etc), HARQ process information, a redundancy version, or a new data indicator (NID), etc.
  • UE ID UE identifier
  • Group ID UE group identifier
  • an allocated radio resource assignment e.g., a duration of the allocated radio resource assignment
  • a transmission parameter e.g., Modulation method, payload size, MIMO related information, etc
  • the terminal performs multiple HARQ processes
  • the multiple HARQ processes are operated synchronously. Namely, each HARQ process is allocated synchronously in every transmission time interval (TTI).
  • TTI transmission time interval
  • a HARQ process 1 may perform in a first transmission time interval (TTI 1)
  • a HARQ process 2 may perform in TTI 2
  • a HARQ process 8 may perform in TTI 8
  • the HARQ process 1 may again perform in TTI 9
  • the HARQ process 2 may again perform in TTI 10, etc.
  • the HARQ processes are allocated in synchronous manner, a certain HARQ process associated with a TTI which receives a PDCCH for initial transmission of a particular data may be used for such data transmission. For example, if the terminal receives a PDCCH including an uplink scheduling information in Nth TTI, the terminal may actually transmit a data in N+4 TTI.
  • the HARQ retransmission of the terminal is operated in a non-adaptive manner. That is, an initial transmission of a particular data is possible only when the terminal receives a PDCCH including an uplink scheduling information. However, the HARQ retransmission of the data can be possibly operated without receiving the PDCCH, as next TTI allocated to a corresponding HARQ process can be used with same uplink scheduling information.
  • transmission parameters may be transmitted through a control channel such as a PDCCH, and these parameters may be varied with a channel conditions or circumstances. For example, if a current channel condition is better than a channel condition of an initial transmission, higher bit rate may be used by manipulating a modulation scheme or a payload size. In contrast, if a current channel condition is worst than a channel condition of an initial transmission, lower bit rate may be used.
  • the terminal checks an uplink scheduling information by monitoring a PDCCH in every TTI. Then, the terminal transmits data through a PUSCH based on the uplink scheduling information. The terminal firstly generates the data in a MAC PDU format, and then stores it in a HARQ buffer. After that, the terminal transmits the data based on the uplink scheduling information. Later, the terminal waits to receive a HARQ feedback from a base station (eNB). If the terminal receives a HARQ NACK from the base station in response to the transmitted data, the terminal retransmits the data in a retransmission TTI of a corresponding HARQ process.
  • eNB base station
  • the terminal receives a HARQ ACK from the base station in response to the transmitted data, the terminal terminates to operate the retransmission of the HARQ.
  • the terminal counts a number of transmissions (i.e. CURRENT_TX_NB) whenever the data is transmitted in a HARQ process. If the number of transmissions is reached to a maximum number of transmissions, which set by an upper layer, data in the HARQ buffer is flushed.
  • the HARQ retransmission is performed according to a HARQ feedback from a base station, a data existence in the HARQ buffer, or a transmission time of a corresponding HARQ process.
  • each of HARQ process may have a HARQ buffer respectively.
  • the value in the NDI (New Data Indicator) field contained in the PDCCH may be used for the UE to determine whether the received data is an initial transmission data or a retransmitted data. More specifically, the NDI field is 1 bit field that toggles every time a new data is transmitted or received. (0 -> 1 -> 0 -> 1 -> ...) As such, the value in the NDI for the retransmitted data always has a same value used in an initial transmission. From this, the UE may know an existence of retransmitted data by comparing these values.
  • the base station eNB
  • the base station must manage or handle all data or signals, which are transmitted by the terminals within the cell, in order to prevent the interferences between the terminals. Namely, the base station must adjust or manage a transmission timing of the terminals upon each terminal's condition, and such adjustment can be called as the timing alignment maintenance.
  • One of the methods for maintaining the timing alignment is a random access procedure.
  • the base station receives a random access preamble transmitted from the terminal, and the base station can calculate a time alignment (Sync) value using the received random access preamble, where the time alignment value is to adjust (i.e., faster or slower) a data transmission timing of the terminal.
  • the calculated time alignment value can be notified to the terminal by a random access response, and the terminal can update the data transmission timing based on the calculated time alignment value.
  • the base station may receive a sounding reference symbol (SRS) transmitted from the terminal periodically or randomly, the base station may calculate the time alignment (Sync) value based on the SRS, and the terminal may update the data transmission timing according to the calculated time alignment value.
  • SRS sounding reference symbol
  • the base station may measure a transmission timing of the terminal though a random access preamble or SRS, and may notify an adjustable timing value to the terminal.
  • the time alignment (Sync) value i.e., the adjustable timing value
  • 'TAC' time advance command
  • the TAC may be process in a MAC (Medium Access control) layer. Since the terminal does not camps on a fixed location, the transmission timing is frequently changed based on a terminal's moving location and/or a terminal's moving velocity. Concerning with this, if the terminal receives the time advance command (TAC) from the base station, the terminal expect that the time advance command is only valid for certain time duration.
  • TAC time advance command
  • a time alignment timer is used for indicating or representing the certain time duration.
  • the time alignment timer is started when the terminal receives the TAC (time advance command) from the base station.
  • the TAT value is transmitted to the terminal (UE) through a RRC (Radio Resource Control) signal such as system information (SI) or a radio bearer reconfiguration.
  • SI system information
  • the terminal if the terminal receives a new TAC from the base station during an operation of the TAT, the TAT is restarted. Further, the terminal does not transmit any other uplink data or control signal (e.g., data on physical uplink shared channel (PUSCH), control signal on Physical uplink control channel (PUCCH)) except for the random access preamble when the TAT is expired or not running.
  • PUSCH physical uplink shared channel
  • PUCCH Physical uplink control channel
  • a MAC layer of the terminal and base station handles a time alignment (synchronize) management.
  • the TAC is generated in the MAC layer of the base station, and the MAC layer of the terminal receives the TAC through a MAC message from the base station.
  • the base station transmits the MAC message including the TAC in a HARQ process, and the terminal attempts to receive the data.
  • the terminal transmits a NACK signal to the base station if the terminal fails to decode the data.
  • the terminal receives an uplink scheduling information through a PDCCH for a transmission of data 1. Then, the terminal transmits the data 1 to the base station using the HARQ process. In response to the transmitted data 1, the terminal receives a NACK from the base station. Therefore the terminal has to retransmit the data 1, however, the TAT of the terminal can be expired before a retransmission of the data 1. In this situation, the terminal can not possibly retransmit the data 1 due to expiry of the TAT. Therefore, the terminal restarts the TAT after receiving a TAC from the base station though a random access channel (RACH) procedure.
  • RACH random access channel
  • the terminal still transmits data 1 at a transmission timing of the HARQ process because the data 1 is still stored in a HARQ buffer of the terminal.
  • the transmission of the data 1 is not expected by the base station, this data transmission can be collided with other data transmission by other terminals.
  • an object of the present invention is to provide a method of processing data for a HARQ (Hybrid Automatic Repeat reQuest) in a wireless communication system, and more particularly, for an optimized uplink HARQ operation when time alignment timer is not running or at an expiry of time alignment timer.
  • HARQ Hybrid Automatic Repeat reQuest
  • a method of processing data for a HARQ (Hybrid Automatic Repeat Request) operation in a wireless communication system comprising: receiving an uplink Grant from a network; generating a data unit based on the received uplink grant; storing the generated data unit into a plurality of buffers; and flushing the stored data unit in the plurality of buffers when a timer expires.
  • HARQ Hybrid Automatic Repeat Request
  • a method of processing data for a HARQ (Hybrid Automatic Repeat Request) operation in a wireless communication system comprising: receiving an uplink Grant from a network; generating a data unit based on the received uplink grant; storing the generated data unit into a plurality of buffers; and flushing the stored data in the plurality of buffers when the timer is not running.
  • HARQ Hybrid Automatic Repeat Request
  • a method of processing data for a HARQ (Hybrid Automatic Repeat Request) operation in a wireless communication system comprising: receiving an uplink Grant from a network; generating a data unit based on the received uplink grant; storing the generated data unit into a plurality of buffers; determining whether or not a timer is running; determining whether a command for starting the timer is received; and flushing the stored data in the plurality of buffers when it is determined that the timer is not running and the command is received.
  • HARQ Hybrid Automatic Repeat Request
  • this disclosure is shown to be implemented in a mobile communication system, such as a UMTS developed under 3GPP specifications, this disclosure may also be applied to other communication systems operating in conformity with different standards and specifications.
  • a terminal may perform a random access procedure in the following cases: 1) when the terminal performs an initial access because there is no RRC Connection with a base station (or eNB), 2) when the terminal initially accesses to a target cell in a handover procedure, 3) when it is requested by a command of a base station, 4) when there is uplink data transmission in a situation where uplink time synchronization is not aligned or where a specific radio resource used for requesting radio resources is not allocated, and 5) when a recovery procedure is performed in case of a radio link failure or a handover failure.
  • the base station allocates a dedicated random access preamble to a specific terminal, and the terminal performs a non-contention random access procedure which performs a random access procedure with the random access preamble.
  • the terminal performs a non-contention random access procedure which performs a random access procedure with the random access preamble.
  • there are two procedures in selecting the random access preamble one is a contention based random access procedure in which the terminal randomly selects one within a specific group for use, another is a non-contention based random access procedure in which the terminal uses a random access preamble allocated only to a specific terminal by the base station.
  • the difference between the two random access procedures is that whether or not a collision problem due to contention occurs, as described later.
  • the non-contention based random access procedure may be used, as described above, only in the handover procedure or when it is requested by the command of the base station.
  • Figure 5 shows an operation procedure between a terminal and a base station in a contention based random access procedure.
  • a terminal in the contention based random access randomly may select a random access preamble within a group of random access preambles indicated through system information or a handover command, may select PRACH resources capable of transmitting the random access preamble, and then may transmit the selected random access preamble to a base station (Step 1).
  • the terminal may attempt to receive a response with respect to its random access preamble within a random access response reception window indicated through the system information or the handover command (Step 2). More specifically, the random access response information is transmitted in a form of MAC PDU, and the MAC PDU may be transferred on the Physical Downlink Shared Channel (PDSCH). In addition, the Physical Downlink Control Channel (PDCCH) is also transferred such that the terminal appropriately receives information transferred on the PDSCH. That is, the PDCCH may include information about a terminal that should receive the PDSCH, frequency and time information of radio resources of the PDSCH, a transfer format of the PDSCH, and the like.
  • the PDCCH may include information about a terminal that should receive the PDSCH, frequency and time information of radio resources of the PDSCH, a transfer format of the PDSCH, and the like.
  • the terminal may appropriately receive the random access response transmitted on the PDSCH according to information of the PDCCH.
  • the random access response may include a random access preamble identifier (ID), an UL Grant, a temporary C-RNTI, a Time Alignment Command, and the like.
  • the random access preamble identifier is included in the random access response in order to notify terminals to which information such as the UL Grant, the temporary C-RNTI, and the Time Alignment Command would be valid (available, effective) because one random access response may include random access response information for one or more terminals.
  • the random access preamble identifier may be identical to the random access preamble selected by the terminal in Step 1.
  • the terminal may process each of the information included in the random access response. That is, the terminal applies the Time Alignment Command, and stores the temporary C-RNTI.
  • the terminal uses the UL Grant so as to transmit data stored in a buffer of the terminal or newly generated data to the base station (Step 3).
  • a terminal identifier should be essentially included in the data which is included in the UL Grant (message 3). This is because, in the contention based random access procedure, the base station may not determine which terminals are performing the random access procedure, but later the terminals should be identified for contention resolution.
  • two different schemes may be provided to include the terminal identifier.
  • a first scheme is to transmit the terminal's cell identifier through the UL Grant if the terminal has already received a valid cell identifier allocated in a corresponding cell prior to the random access procedure.
  • the second scheme is to transmit the terminal's unique identifier (e.g., S-TMSI or random ID) if the terminal has not received a valid cell identifier prior to the random access procedure.
  • the unique identifier is longer than the cell identifier.
  • the terminal After transmitting the data with its identifier through the UL Grant included in the random access response, the terminal waits for an indication (instruction) of the base station for the contention resolution. That is, the terminal attempts to receive the PDCCH so as to receive a specific message (Step 4).
  • the terminal attempts to receive the PDCCH so as to receive a specific message (Step 4).
  • the terminal determines that the random access procedure has been successfully (normally) performed, thus to complete the random access procedure.
  • the terminal checks data (message 4) transferred by the PDSCH that the PDCCH indicates. If the unique identifier of the terminal is included in the data, the terminal determines that the random access procedure has been successfully (normally) performed, thus to complete the random access procedure.
  • Figure 6 shows an operation procedure between a terminal and a base station in a non-contention based random access procedure.
  • the random access procedure is determined to be successfully performed by receiving the random access response information in the non-contention based random access procedure, thus to complete the random access process.
  • the non-contention based random access procedure may be performed in the following two cases: one is the handover procedure, and the other is a request by the command of the base station.
  • the contention based random access procedure may also be performed in those two cases.
  • First, for the non-contention based random access procedure it is important to receive, from the base station, a dedicated random access preamble without having any possibility of contention.
  • a handover command and a PDCCH command may be used to assign the random access preamble.
  • the terminal transmits the preamble to the base station. Thereafter, the method for receiving the random access response information is the same as that in the above-described contention based random access procedure.
  • the present invention proposes a method of flushing data in all HARQ buffer of the terminal when a time alignment timer (TAT) is not running or is expired.
  • TAT time alignment timer
  • Figure 7 shows an exemplary view of flushing data in HARQ buffer at an expiry of time alignment timer (TAT) according to the present invention.
  • TAT time alignment timer
  • the present invention proposes to flush all HARQ buffers at the TAT expiry. More detailed description of Figure 7 will be given as following.
  • the terminal may receive a PDCCH (Physical Downlink Control Channel) including an uplink scheduling information (i.e. UL grant) for a data transmission of an uplink.
  • the PDCCH may include a C-RNTI (Cell-Radio Network Temporary Identifier) or Semi-Persistent Scheduling C-RNTI (SPS C-RNTI).
  • C-RNTI Cell-Radio Network Temporary Identifier
  • SPS C-RNTI Semi-Persistent Scheduling C-RNTI
  • the terminal may generate a MAC PDU (referred as MAC PDU-1 hereafter) according to the received uplink scheduling information, and may store the generated MAC PDU-1 in a corresponding HARQ buffer. Further, the terminal may transmit the stored MAC PDU-1 to the base station at a transmission timing of a corresponding HARQ process. After the MAC PDU-1 is transmitted, the terminal may wait to receive a HARQ feedback from the base station. At this moment, the time alignment timer (TAT) of the terminal may expire. According to the present invention, the terminal may flush data in all HARQ buffers including a HARQ buffer having the MAC PDU-1 at the time of TAT expiry.
  • TAT time alignment timer
  • Figure 8 shows an exemplary view of flushing data in HARQ buffer when a time alignment timer (TAT) is not running according to the present invention.
  • TAT time alignment timer
  • the present invention proposes to flush all HARQ buffers when the TAT is not running. More detailed description of Figure 8 will be given as following.
  • the terminal may flush data in all HARQ buffers.
  • a current TAT of the terminal is not running and there is no data in all HARQ buffers.
  • the terminal may further receive a PDCCH including an uplink scheduling information for an uplink data transmission.
  • the PDCCH may include a C-RNTI (Cell-Radio Network Temporary Identifier) or Semi-Persistent Scheduling C-RNTI (SPS C-RNTI).
  • the terminal may generate a MAC PDU (referred as MAC PDU-2 hereafter) according to the received uplink scheduling information, and may store the generated MAC PDU-2 in a corresponding HARQ buffer.
  • MAC PDU-2 referred as MAC PDU-2 hereafter
  • the terminal may flush data in all HARQ because the TAT of the terminal is not running.
  • Figure 9 shows an exemplary view of flushing data in HARQ buffer by receiving a new timing advance command (TAC) when a time alignment timer (TAT) is not running according to the present invention.
  • TAC timing advance command
  • TAT time alignment timer
  • the present invention proposes to flush all HARQ buffers when the terminal receives a new TAC while a TAT of the terminal is not running after its expiration. More detailed description of Figure 9 will be given as following. After the TAT is expired, the terminal may flush data in all HARQ buffers. While the TAT is not running, the terminal may further receive a PDCCH including an uplink scheduling information for an uplink data transmission.
  • the PDCCH may include a C-RNTI (Cell-Radio Network Temporary Identifier) or Semi-Persistent Scheduling C-RNTI (SPS C-RNTI).
  • the terminal may generate a MAC PDU (referred as MAC PDU-3 hereafter) according to the received uplink scheduling information, and may store the generated MAC PDU-3 in a corresponding HARQ buffer.
  • the terminal may attempt to transmit the MAC PDU-3 to the base station. However, since the TAT is not running, the terminal may not transmit the MACE PDU-3.
  • the MAC PDU-3 is kept in the corresponding HARQ buffer.
  • the terminal may receive a new TAC.
  • the terminal may receive the new TAC by a random access response during the random access channel (RACH) procedure.
  • RACH random access channel
  • the terminal may notify RRC of PUCCH/SRS release and may clear any configured downlink assignment and uplink grants.
  • the present disclosure may provide a method of processing data for a HARQ (Hybrid Automatic Repeat Request) operation in a wireless communication system, the method comprising: receiving an uplink Grant from a network; generating a data unit based on the received uplink grant; storing the generated data unit into a plurality of buffers; and flushing the stored data unit in the plurality of buffers when a timer expires, wherein the timer is a Time Alignment Timer (TAT), the uplink grant is received on a PDCCH (Physical Downlink Control Channel), the uplink grant includes at least one of uplink scheduling information, a C-RNTI (Cell-Radio Network Temporary Identifier), and a Semi-persistent Scheduling C-RNTI, the data unit is MAC PDU (Medium Access Control Protocol Data Unit), and the plurality of buffers is all uplink HARQ buffers.
  • TAT Time Alignment Timer
  • PDCCH Physical Downlink Control Channel
  • the uplink grant includes at least one
  • the present invention may provide a method of processing data for a HARQ (Hybrid Automatic Repeat Request) operation in a wireless communication system, the method comprising: receiving an uplink Grant from a network; generating a data unit based on the received uplink grant; storing the generated data unit into a plurality of buffers; and flushing the stored data in the plurality of buffers when the timer is not running, wherein the timer is a time Alignment timer (TAT), the uplink grant is received on a PDCCH (Physical Downlink Control Channel), the uplink grant includes at least one of uplink scheduling information, a C-RNTI (Cell-Radio Network Temporary Identifier), and a Semi-persistent Scheduling C-RNTI, the data unit is MAC PDU (Medium Access Control Protocol Data Unit), and the plurality of buffers is all uplink HARQ buffers.
  • TAT time Alignment timer
  • the uplink grant is received on a PDCCH (Physical Downlink Control Channel
  • the present invention may provide a method of processing data for a HARQ (Hybrid Automatic Repeat Request) operation in a wireless communication system, the method comprising: receiving an uplink Grant from a network; generating a data unit based on the received uplink grant; storing the generated data unit into a plurality of buffers; determining whether or not a timer is running; determining whether a command for starting the timer is received; and flushing the stored data in the plurality of buffers when it is determined that the timer is not running and the command is received, wherein the command is a Timing Advance Command (TAC).
  • TAC Timing Advance Command
  • the present disclosure is described in the context of mobile communications, the present disclosure may also be used in any wireless communication systems using mobile devices, such as PDAs and laptop computers equipped with wireless communication capabilities (i.e. interface). Moreover, the use of certain terms to describe the present disclosure is not intended to limit the scope of the present disclosure to a certain type of wireless communication system. The present disclosure is also applicable to other wireless communication systems using different air interfaces and/or physical layers, for example, TDMA, CDMA, FDMA, WCDMA, OFDM, EV-DO, Wi-Max, Wi-Bro, etc.
  • the exemplary embodiments may be implemented as a method, apparatus or article of manufacture using standard programming and/or engineering techniques to produce software, firmware, hardware, or any combination thereof.
  • article of manufacture refers to code or logic implemented in hardware logic (e.g., an integrated circuit chip, Field Programmable Gate Array (FPGA), Application Specific Integrated Circuit (ASIC), etc.) or a computer readable medium (e.g., magnetic storage medium (e.g., hard disk drives, floppy disks, tape, etc.), optical storage (CD-ROMs, optical disks, etc.), volatile and non-volatile memory devices (e.g., EEPROMs, ROMs, PROMs, RAMs, DRAMs, SRAMs, firmware, programmable logic, etc.).
  • FPGA Field Programmable Gate Array
  • ASIC Application Specific Integrated Circuit
  • Code in the computer readable medium may be accessed and executed by a processor.
  • the code in which exemplary embodiments are implemented may further be accessible through a transmission media or from a file server over a network.
  • the article of manufacture in which the code is implemented may comprise a transmission media, such as a network transmission line, wireless transmission media, signals propagating through space, radio waves, infrared signals, etc.
  • a transmission media such as a network transmission line, wireless transmission media, signals propagating through space, radio waves, infrared signals, etc.
EP09001422.6A 2008-02-01 2009-02-02 Verfahren für einen HARQ-Aufwärtsverbindungsbetrieb bei Ablauf des Zeitanpassungszeitgebers Active EP2086258B1 (de)

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US9049018B2 (en) 2015-06-02
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US20140341160A1 (en) 2014-11-20
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US8812925B2 (en) 2014-08-19
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EP2665306A1 (de) 2013-11-20
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US8312336B2 (en) 2012-11-13
USRE49442E1 (en) 2023-02-28
US20150229449A1 (en) 2015-08-13
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